Combine all the dough ingredients and work into a smooth dough. Knead thoroughly and then roll out directly on a paper-lined baking sheet dusted with a little flour (this way you wont have to transfer it and it cant fall apart).
Spread the gouda cheese pieces on the edge of the dough leaving some space so that you can fold the edge over the cheese to seal it.
Spread dough (except for cheese edge) with pasta sauce or puree and top with veggies.
Sprinkle with grated cheese and mozzarella slices. YOu can also put them on top of your cheese edge.
Bake in the preheated oven at 200°C/400°F on the middle rack for 10 minutes. Then transfer to lowest rack, bake another 10 minutes and transfer back to middle rack for the last 5-10 minutes. Your pizza should be nicely browned and the dough not sticky anymore.